PRN     Azimuth(d)     Elevation(d)   Vertical-TEC(tecu)    Slant-TEC(tecu)       S4(L1/L2)    2017/12/19-19:42:50
G01     313.7          27.0                7.9 +/-    1.71      14.7 +/-    1.71  0.100 / 0.140
G10     95.6           46.8                8.6 +/-    0.59      11.3 +/-    0.59  0.080 / 0.210
G11     292.6          26.8                5.7 +/-    0.96      10.7 +/-    0.96  0.140 / 0.250
G14     333.8          70.2                7.5 +/-    0.55       7.9 +/-    0.55  0.150 / 0.250
G18     111.6          19.3                9.8 +/-    1.53      21.8 +/-    1.53  0.030 / 0.040
G22     305.9          18.4                7.9 +/-    1.46      18.0 +/-    1.46  0.040 / 0.040
G25     90.7           13.5               10.6 +/-    1.62      27.2 +/-    1.62  0.040 / 0.020
G31     174.5          53.7               10.8 +/-    0.63      13.0 +/-    0.63  0.030 / 0.030
G32     24.4           59.6                7.8 +/-    0.89       8.9 +/-    0.89  0.040 / 0.030